Strange brake problem - Near side brake sticking, thought it was a sticky cylinder. ok for a few days after apparently unsticking and now the brakes feel very spongy at first and the brake peddle has lots of play at the start of a journey but throughout the journey they become more firm untill eventually the near side rear decides to stick on again. left the car for a while and brake releases its self? But Same thing keeps happening ok on journeys without much braking but lots of stopping and starting it soon returns. Yesterday the near side rear was completely siezed on so took wheel off and loosened bleed nut to let a small amount of fluid out and brake instantly released, making me believe its not a sticky cylinder problem? Can anybody help? do i need to complety rebleed the whole system or is it gonna be an expensive stealer repair? oh its an 1999 A6 Quattro 2.5tdi Avant.